<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>WebGL ClearColor Test</title>
</head>
<style>
  html, body {
    margin: 0;
  }
  #canvas {
    width: 640px;
    height: 480px;
    background-color: red;
  }
</style>
<body>
<div id="canvas"></canvas>
</body>
</html>
